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<h1 align="center">首页</h1>
<h3 align="center"><a href="ajax.jsp" target="_blank">Ajax和JSON的简单使用</a></h3>
<h3 align="center"><a href="checkUserName.jsp" target="_blank">Ajax和JSON用户名验证</a></h3>
<h3 align="center"><a href="erjiliandong.jsp" target="_blank">Ajax和JSON二级联动</a></h3>
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